My dad, who is from Dominica, has always sung that song to me when we discuss Christopher Columbus. It is amazing to him how someone can discover somewhere that was already inhabited by people. This man had a huge effect on history, but not as the way we celebrate it today. He was involved not only the dehumanization of Native American populations, but also in the start of the African slave trade. Many people think of him in disgust and yet we are forced to recite how he “discovered America” in 1492 as if it was a great, positive accomplishment for all of us. All of it speaks to the erasure of history and people, from treating people who live in a space as invisible or non-important to ignoring the destruction that came from it.
This website Transform Columbus Day speaks more about the atrocities committed by Columbus.
Reconsider Columbus Day
Sherese Francis: Futuristically Ancient 
Just wrote an essay on Columbus and preached it. Used the dates of August 2nd, 1492 and the expulsion of the Jews from Spain and August 3rd Columbus’ departure.
Interesting. If you can make it available, I would like to read it.
It is on the blog and I have an update with a Meade article about the origins of the holiday, it might surprise you.